This thread is to gather information about the Truck, 15-cwt, 4x2, A.A.
From:
http://bcoy1cpb.pacdat.net/20_mm_aa_guns.htm
Page from British Data Book (reprint) showing the CMP portee with gun mount, but no gun.
Page from the AEDB Design Record showing a Canadian Military Pattern 20mm AA 15 Cwt Cab 13 truck under test (thus the "EE" on the door) probably the prototype:
A 20mm gun mounted on a Universal Mounting on the back of a CMP 15 Cwt, War Department number Z 5194984. Photo - Andy Morgan
A 20mm gun, possibly the same one as shown above, shown deployed on the ground. Photo - Andy Morgan